Measuring valve



y 1936- s. s. ROBERTS 2,041,023

. MEASURING VALVE Filed April 26, 1935 Inventor" 54ML/EL 6. ROBERTS,

Patented May 19,

NT-* HCE MEASURING VALVE Samuel S. Roberts, Pittsburgh, Pa. ApplicationApril 26, 1933, Serial No. 668,131

2 Claims.

Figures 2, 3 and 4 are lateral cross-sections,

taken from the respectively Roman numeraled lines in Figure 1. i

A cylinder 1 contains a piston 2. A passageway 3, of smallercross-sectional area than the cylinder, extends longitudinally from oneof the latters ends with a by-pass 3" opening thereinto. A duct 4opensinto the passageway 3 both at a point registering with the bye-pass3* and at a point therebeyond. It also opens into the opposite end ofthe cylinder.

A plunger 5 fits the passageway 3 and has a reduced section 5registering with the by-pass I when itsmain body portion covers the'ducts opening therebeyond. Thisplunger includes a connecting part whichprojects up into the cylin- I der so as to oppose the piston 2. Thispart consists of a threaded stem 6 over which an apertured wash'er I isplaced and held by a nut 8.

The cylinder I has a counterbore I which receives this washer and limits'themotion of the plunger 5 to its operating range.

A compression spring 9 is arranged in the cylinder I between the piston2 and the connecting part of the plunger 5 so as to push them inopposite directions. The piston itself includes a stem l0 projectingthrough the end of the cylinder and provided with an adjustable stop inthe form of nuts ll threaded thereon. This stem passes through astufling box II. The cylinder is provided with an outlet l arranged at apoint somewhere beyond the working stroke or the piston 2.

In operation, lubricant under pressure is applied to the valve throughthe passageway 3, the end of which is suitably threaded for applicationto the lubricating line by the usual connection. This forces the plunger5 against the compression spring 9, so that it moves to a point whereits body covers the by-pass and the opening oi the ,duct 4 registeringtherewith, and simultaneously frees the ducts opening therebeyond.

55 The lubricant flows through the duct to the other scope of theinvention exactly thereto, except as end of the cylinder and forcesthepiston 2 downwardly against the compression spring 9.

Thus the compression spring functions to operate both the plunger 5,which acts as a reciprocating valve, and the piston 2. Other devicesgenerally use a small auxiliary spring to control the inlet valve. Sucha little spring is generally unreliable and, in any event, increases thecost.

When pressure in the line connected to the passageway 3 is released, thespring 9 first func- 1Q tions to push the plunger 5 to its originalposition, and then pushes the piston 2 so the grease is forced to theother end of the cylinder by way of the duct I and its openingregistering with the by-pass 3*, the reduced portion 5 of the plungerbeing in a position to permit this. The difierent sizes of the pistonand' plunger' insure this sequence.

This places the valve in operative condition,- and the nextintroductionol lubricant under pressure to the passageway duplicates theaction already described, except that the piston 2 now forces thelubricant through the outlet i to the point of lubrication. I

The movement of .the piston is visually indicated by the stern l0, andthe valvemaybe adf justed to' deliver determinable charges of lubri 4cant by holding a small rule to this stem, measuring its stroke andadjusting the nuts ll accordingly. 30 Although a specific form ofthis-invention has been shqwn and described in accordance with thepatent statutes, it .isnot'intended to'limit the defined by thefollowing claims.

I claim: r

1. A measuring valve comprising a cylinder, a piston in said cylinder, apassageway of smaller area than said cylinder and extendinglongitudinally from one end thereof with a by-pass opening thereinto, aduct opening into said passageway both at a point registering with saidby-pass and at a point therebeyond and also opening into the oppositeend of said cylinder, a plunger'fltting said passageway with a reducedsection registering with said by-pass when its body covers said ductsopening therebeyond and having a connected part projecting up into saidcylinder so as to oppose said piston, an outlet opening from saidcylinder beyond the limits of said pistons stroke, and a compressionspring arranged between said piston and said connected part so as tomove them in opposite directions, said plunger being constructed tocut-oi! communication between said by-pass and said duct when} I lnov'ed bithe l'ntreduction of matter under ureame to 'a position whereitsbody leaves aatddnet'u opening therebeyond.- e

'2. A me'asm'lng valve 1; cylinder; 5 pistonln said cylinder-,1;passageway .0! smaller m than said cylinder and extending lonzitudinallyhtrom one end thereof with a by-pam openingl thereinto, a. ductopening into and. me-

, way both ata point snld bypess'and at a. point therebeyond'md alaoopen-U in; into the bppodte end, offenld-fcylindir. I

1 plungernttlng said 'peaaageway with reduced section. registering withsaid'hy-baas when its v body covers snld ducts therebeyond endhavingmeonneted nrbjeeting up cylinder-no! to outlet-:

mam

openlngtrom said cylinder beyond the flxnltajbf lee-id piqton'eltx'okeflnnd n and mind part so u to move theminoppodtedkecflom.

s'ald cylinder ma prfivgded with hymn-able;

stopnnd constructed to cuton cmnmunicdtlon Mew-Mind said duct when m v dh under pressure to a position where new-mm .sald duct:openlnzthereheyondr sum 3. I

